to answer your questions, yes, it was decently laggy for me and I don’t think it’s the recording. Also, if you see in the video, when I try to go near the computer, the hand won’t pop up when I go near it.
You can only interact with the Binoculars, the Rifle, the report sheet on the desk, the pills ans the bed in the cabin. A hand will appear if you haver over those items. Equip items with E. Unequip with X. The Computer is just giving you the instructions which coordinates you have to check. For example in the beginning you have to check coordinate C1 (look at the map on the table to see where C1 is) you then grab the binoculars, left mouseclick to get into zoom mode you can zoom with the scroll wheel. Scan with right mouse button. you have Scanned the right animal you can write the report sheet and take it to the fax. The Computer will give you new instructions then. At the end of the day you take your pills and go to sleep.
Hope this helps